rename pred_mv_s8 to pred_mv

Change-Id: Ib1088c3fc80952074e098385fe5eb81742e7dc59
diff --git a/av1/common/blockd.h b/av1/common/blockd.h
index 4a0466f..94eb089 100644
--- a/av1/common/blockd.h
+++ b/av1/common/blockd.h
@@ -146,7 +146,7 @@
   PREDICTION_MODE as_mode;
   int_mv as_mv[2];  // first, second inter predictor motion vectors
 #if CONFIG_REF_MV
-  int_mv pred_mv_s8[2];
+  int_mv pred_mv[2];
 #endif
 #if CONFIG_EXT_INTER
   int_mv ref_mv[2];